DROP INDEX - dropping index of a table in a named schema

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Page: https://www.postgresql.org/docs/15/sql-dropindex.html
Description:

I had to find out (as it is not in the given documentation) that to drop an
index for a table in a named schema (later "schemaname.tablename") you have
to prefix the schemaname for the index inte DROP statement.

Consider
CREATE INDEX indexname ON schemaname.tablename ()

To drop it you will have to perform
DROP INDEX schemaname.indexname
(as I have read that indices are tied to schemas) 

The following statement will fail (which was not clear from documentation)
DROP INDEX indexname